Emotet — Office (OOXML) / .XLSX malware analysis

Static analysis result for SHA-256 721f61514140da3e…

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000
MD5: f9a818b836f4dc07796d6615a0bc859f SHA-1: 2ec1c5ef16d27753b4fd0877ed121dae94f45c2f SHA-256: 721f61514140da3e2aaca24e7b95fd704da3d3ba74adff9189e00d57ae50c7fc
200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The sample is identified as Emotet by ClamAV and exhibits characteristics of a downloader. The Workbook_Open macro is present, which is a common execution vector for Emotet. The script attempts to download and execute a second-stage payload using obfuscated PowerShell commands, including the reconstructed URL 'http://sumedhaonline.com/wp-content/HyzNXJ30XQEVcBRH/'. The presence of Wscript.Shell and CreateObject calls further supports this analysis.

Heuristics 5

  • ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 12041 bytes
vbaProject_00.bin
e7cdf09f94a1bc670feefb0018dcfd3647c69846ee3c523ad03a11fa0b59e835		 vba-project OOXML VBA project: xl/vbaProject.bin 42496 bytes

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